211213380 has 96 divisors (see below), whose sum is σ = 699229440. Its totient is φ = 46609920.

The previous prime is 211213363. The next prime is 211213397. The reversal of 211213380 is 83312112.

It is an interprime number because it is at equal distance from previous prime (211213363) and next prime (211213397).

It is a super-2 number, since 2×211213380² = 89222183782048800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3510 + ... + 20850.

It is an arithmetic number, because the mean of its divisors is an integer number (7283640).

Almost surely, 2^211213380 is an apocalyptic number.

211213380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211213380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349614720).

211213380 is an abundant number, since it is smaller than the sum of its proper divisors (488016060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211213380 is a wasteful number, since it uses less digits than its factorization.

211213380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17389 (or 17387 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 211213380 is about 14533.1820328516. The cubic root of 211213380 is about 595.5347968114.

Adding to 211213380 its reverse (83312112), we get a palindrome (294525492).

The spelling of 211213380 in words is "two hundred eleven million, two hundred thirteen thousand, three hundred eighty".